I did a focus adjustment today in my backyard, I went from -20 to + 20 and saw no improvement. That is why I stated it had no effect. What I have noticed is that the farther away I am from the object the more the focus is off. So today when I tried to adjust the focus I was only 10-15 feet from the focusing target, I will have to try it again but from 50+ feet away. After doing more shooting with the camera tonight with my 24-70 I made some more observations, it has the same issue at distances. within 25 feet focus is very good but past that is starts to back focus. My concern is that if I get the distance focus more accurate will it mess up my close focus?

I have not had to do any focus adjustments with my other cameras so I would be interested in hearing from people with more experience with this then me.